Rotary offset printing press with cylinder interrupter

ABSTRACT

An offset printing press wherein the printing and blanket rolls are readily changeable to permit the use of rolls of different diameters for printing sheets of different length and wherein the blanket roll is mounted on a pivoted arm adapted to be moved toward and away from the printing roll and impression roll and to be locked in an adjusted position to which it is moved.

United States Patent [56] References Cited NITED STATES PATENTS [72]Inventor Dewey L. Harrison Fort Worth, Tex.

8400661087 l lllll-l l. i I n .mm fln mkr n o dh 0 w e .l S r. blVuml fooac a a RHDB. KBH 455 5723 3455566 9999999w wvwwwwww ll 1 30002 9647594823 v 7871 6248 0887 930 Ila-422233 u .m h c m e v u c u 9 67-MQM99 6 'd- 0 432 8 33m Wm maunmn SOONIE 0. dc dw wmm n AHPA nflu 2247Primary Examiner-J. Reed Fisher Attorney-Sperry and Zoda H T I W S s E RP ma E T IPQ R m PRF T E .m STW m m D R m? R mm TLh OYC RC1 M UABSTRACT: An offset printing press wherein the printing and blanketrolls are readily changeable to permit the use of rolls of differentdiameters for printing sheets of different length and wherein theblanket roll is mounted on a pivoted arm adapted to be moved toward andaway from the printing roll and impression roll and to be locked in anadjusted position to which it is moved.

Pmmumm 3511,2324

SNIEEIHIFZ I INVENTOR A TTORNEXS PATENTEllncnzlsn. $611,824

' sum 2 or 2 Dewey 4.. lmkkl oal INVENTOR A TToRNE Y5 ROTARY OFFSETPRINTING PRESS WITH CYLINDER INTERRUPTER FIELD OF INVENTION I In orderto permit printing equipment to print sheets of different length, it isnecessary to provide printing and blanket rolls of different diameterwhich can be interchanged as required. However, the equipment andconstructions heretofore used for this purpose have been complicated andexpensive and considerable time and labor are necessary in order to makeand change required for printing sheets of dilferent length.

In accordance with the present invention, constructions are providedwhich are relatively simple and inexpensive and which permit readychange of the printing and blanket rolls with a minimum of time andlabor. For this purpose, the printing roll is mounted on a shaft whichis movable into and out of a slot in the frame of the machine whereasthe blanket roll is removably mounted on an arm which is movable toswing the blanket roll toward and away from the printing or plate rollto the proper operative position where it may be locked in place.

THE DRAWINGS.

FIG. 1 is a vertical sectional view of a portion of a typical offsetprinting press embodying the present invention,

FIG. 2 is a sectional view of a portion of the construction shown inFIG. 1 illustrating the location and relation of the elements employedfor moving the ink rolls into and out of operative relation with respectto the plate roll, and

FIG. 3 is a plan view of those elements shown in FIG. 2.

In that form of the invention chosen for purposes of illustration in thedrawings, the printing press has two similar side frame members, one ofwhich is shown at 2, and each of which is provided with a horizontalslot 4 for receiving and supporting a shaft 6 upon which a plate roll 8is rotatably mounted by means of adjustable bearings 10. The shaft 6 andits bearings are each secured in place at the inner end of slot 4 bymeans of a positioning block 12 and retaining means 14. A blanket roll16 is mounted for rotation on a shaft 18 supported by means of bearings20 carried by similar arms 22 which are located adjacent the inner faceof each side frame member 2 and which are secured at their lower ends ona rock shaft 24 mounted for rotation on the side frame members. Theupper free end of each arm 22 is provided with a bearing cradle orrecess 26 for receiving the eccentric or other adjustable bearing cradleor recess 26 for receiving the eccentric or other adjustable bearing 28in which shaft 18 of the blanket roll 16 is mounted. A retaining block30 is secured to the arm 22 over the bearing 28 by means of bolts 32 tosecure the shaft 18 and blanket roll in place of the arm 22 whilepermitting easy removal and substitution of a blanket roll of onediameter for a blanket roll of a different diameter corresponding to thediameter of the plate roll to be employed in any printing operation.

The blanket roll 16 is movable toward and away from the plate roll 8 andinto and out of operative relation therewith by suitable adjusting meanssuch as a worm 34 carried by a blanket roll adjusting shaft 36 andengaging a worm gear 38 on shaft 40. The shaft 40 has a pinion 42thereon which meshes with an arcuate rack or gear segment 44 secured tothe rock shaft 24. The blanket roll and its shaft 18 are capable of easyand minor adjustment in position by means of eccentric bearing 28 toassure the proper relation thereof with respect to the plate roll 8 andan impression roll 84. At the same time the adjusting means securelyholds the blanket roll in any adjusted position to which it may bemoved.

Adjustable ink rolls 46 and 48 are engageable with the plate roll 8 andare supplied with ink by an oscillating inking roll 50 which isrotatable about a shaft 52 and movable transversely of the press andlongitudinally of the ink rolls 46 and 48 by conventional means, notshown. The ink roll 46 is rotatable on a shaft 54 by means of a bearing56 slidable within a channel 58 of a roller holding bracket 60. As shownin FIGS. 2 and 3, the bracket 60 is pivotally mounted for movement aboutshaft 52 of the oscillating inking roll 50 and is provided with atoothed segment 62 engaged by a pinion 64 on ink roll adjusting shaft66. In a similar way the ink roll 48 is rotatable on a shaft 68supported by bearings 70 slidable within the vchannel 72 of a rollerholding bracket 74 pivotally mounted on the shaft 52 of the oscillatinginking roll 50. Bracket 74 has a toothed segment 76 engaged by a pinion78 on ink roll adjusting shaft 80.

The ink rolls 46 and 48 are located on opposite sides of the shaft 52 ofthe oscillating inking roll 50 and are removable arcuately about theaxis of rotation of the oscillating inking roll by means of adjustingshafts 66 and 80 while remaining in operative engagement with theoscillating inking roll. At the same time such adjustment of the inkrolls 46 and 48 serves to move them into and out of position to properlyapply the printing ink to a plate roll of any selected diameter.

With the construction thus provided a, web of material 82 to be printedis passed over an impression roll 84 and into contact with the blanketroll 16 to which ink has been applied by the plate roll 8 from ink rolls46 and 48. The length of the web 82 which is printed on each rotation ofthe blanket roll 16 and plate roll 8 will, of course, depend upon thediameter of these rolls. However, when it is desired the change thelength of the web to be printed on each rotation of the plate andblanket rolls these rolls may be changed to substitute correspondingrolls which are of equal diameter but which differ in diameter from thatof the roll previously employed.

In-order to effect such a change, the blanket roll adjusting shaft 36 isrotated to cause the free end of arm 22 and the blanket roll 16 with itsshaft 18 to swing outward away from the plate roll 8 and impression roll84 to the dotted line position of FIG. 1. The bolts 32 and retainingblock 30 can then be removed to permit the blanket roll 18 to be liftedout. The plate roll 8 will then be exposed for removal and replacementand for this purpose the ink roll adjusting shafts 68 and 80 are rotatedto move the ink rolls 46 and 48 arcuately about the oscillating inkingroll 50 and away from the plate roll 8. Retaining means 14 andpositioning block 12 are then displaced whereupon the plate roll 8 andits shaft 6 and bearings 10 can slide out of the frame members 2 alongthe horizontal slots 4.

For substitution of replacement plate and blanket rolls of the desiredand different diameter as represented in dotted lines in FIG. 1, the newplate roll is moved into place by sliding its shaft and bearings intothe horizontal slots 4 and securing them in place by means of thepositioning block 12 and retaining means 14. The substitute blanketroll, which is of course, of the same diameter as the substitute plateroll, is then mounted on the free ends of the pivoted arms 22 and swinginward into contact with the plate roll and impression roll by rotationof the blanket roll adjusting shaft 36. The impression roll ispreferably mounted for rotation about a fixed axis and is ofpredetermined diameter since it is not displaced or removed in replacingthe plate roll arid blanket roll. Any minor adjustments of the blanketroll to effect the proper contacting of the blanket roll with both theplate roll and the blanket roll can be effected by manipulation of theadjustable bearings on the shafts of the plate roll and blanket roll.

The ink rolls 46 and 48 are then moved into contact with the plate roll8 by rotation of the ink roll adjusting shafts 66 and 80 whereupon thepress is readied for printing repeated but different lengths of the web82 in thedesired manner.

The substitution of plate and blanket rolls and the accurate adjustmentthereof with respect to each other and with respect to the ink applyingrolls can thus be effected quickly and easily without displacement ofthe impression roll. As a result the versatility of the printing pressand its ability to print various different lengths and types of sheetmaterial is greatly increased whereas the amount of time and laborinvolved in effecting such changes is minimized. The same printing presscan accordingly be used to print forms of the like which are measured ineither inches or by the metric system and it is possible to establishthe location of transverse perforations, numbers and the like inpredetermined positions with respect to the printing applied to a web ofmaterial.

I claim:

1. An offset printing press comprising:

a. a plate roller and a blanket roller;

b. supporting shafts extending axially from each said plate roller andblanket roller;

c. a frame for supporting said plate roller;

d. a slot formed to extend generally horizontally within said frame forreceiving the support shaft associated with said plate roller;

e. said slot having a length being at least as great as the diameter ofthe shaft supporting said plate roller;

f. means for holding the shaft supporting said plate roller in a fixedposition within said slot;

g. a pair of upwardly extending arms pivotally mounted on said frame andprovided at the free ends thereof with means for releasably supportingthe shaft supporting said blanket roller to facilitate the changing ofsaid blanket roller;

h. said blanket roller being journaled for rotation by adjustablebearing means mounted at the free ends of said pair of upwardlyextending arms;

i. gear drive means associated with said upwardly extending arms forpivoting said blanket roller from a plate roller engaging position to anouter plate roller disengaged position in response to the application oftorque to said gear drive means;

j. sajd gear drive means being further operable to precision adjust andthen to lock said arm in a desired position;

k. a fixed inking roller journaled within said frame for rotation abouta stationary axis disposed parallel with and above the axis of saidplate roller;

1. at least one adjustable inking roller engageable with both said fixedinking roller and said plate roller; and

m. gear means for revolving said adjustable inking roller along an arcof constant radius about said stationary axis of said fixed inking froma plate roller engaging position to a plate roller disengaged positionwhile maintaining contact between said adjustable inking roller and saidfixed inking roller.

1. An offset printing press comprising: a. a plate roller and a blanketroller; b. supporting shafts extending axially from each said plateroller and blanket roller; c. a frame for supporting said plate roller;d. a slot formed to extend generally horizontally within said frame forreceiving the support shaft associated with said plate roller; e. saidslot having a length being at least as great as the diameter of theshaft supporting said plate roller; f. means for holding the shaftsupporting said plate roller in a fixed position within said slot; g. apair of upwardly extending arms pivotally mounted on said frame andprovided at the free ends thereof with means for releasably supportingthe shaft supporting said blanket roller to facilitate the changing ofsaid blanket roller; h. said blanket roller being journaled for rotationby adjustable bearing means mounted at the free ends of said pair ofupwardly extending arms; i. gear drive means associated with saidupwardly extending arms for pivoting said blanket roller from a plateroller engaging position to an outer plate roller disengaged position inresponse to the application of torque to said gear drive means; j. saidgear drive means being further operable to precision adjust and then tolock said arm in a desired position; k. a fixed inking roller journaledwithin said frame for rotation about a stationary axis disposed parallelwith and above the axis of said plate roller; l. at least one adjustableinking roller engageable with both said fixed inking roller and saidplate roller; and m. gear means for revolving said adjustable inkingroller along an arc of constant radius about said stationary axis ofsaid fixed inking from a plate roller engaging position to a plateroller disengaged position while maintaining contact between saidadjustable inking roller and said fixed inking roller.